thanks, with deep focus about solderingi think you also expert about electronic

just apply on led, light of led can through with good brightness, it made you feel as transparent area

I use Eagle PCB of Autodesk

I not expert about wood, so can't confirm wood or plasticonly thing i can sure it have waterproof and self-adhesive, like sticker, decalback side have info manufacturer : "SHIN LUNG - Product of Taiwan"i think same as this product : goo.gl/0ccA9ythat's all info i have, hope useful for you

i curious about your word unfilled :)focus to main question, because esp8266 consume large power, so when enable wifi, heat will up at 5v & 3.3v regulator ic (not hot, just warm)if you use wifi for short time, so don't need coolerif worry about result of temperature sensor, you can isolate temp-sensor by aluminum or silver foil, or drill some holes for air flow into box casealso don't use 12V power supply, heat will up, good power about 7~9V